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König, Rudolph. 1862, ca. [Letter to Franciscus Donders concerning phonautograph and Helmholtz resonators]. (University Museum Utrecht, Archive)

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Max Planck Institute for the History of Science, Berlin
Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg
Fakultät Medien, Bauhaus-Universität Weimar